from django.db import models
from shop.models import WeChatUser, ESP32Config, Order, Service, VCCourse, ServiceOrder

class Activity(models.Model):
    """
    社区活动模型
    """
    title = models.CharField(max_length=100, verbose_name="活动标题")
    description = models.TextField(verbose_name="活动详情")
    banner = models.ImageField(upload_to='activities/banners/', verbose_name="活动Banner图", null=True, blank=True)
    banner_url = models.URLField(verbose_name="活动Banner链接", null=True, blank=True, help_text="可直接填写图片链接，若同时上传图片，将优先显示上传的图片")
    start_time = models.DateTimeField(verbose_name="开始时间")
    end_time = models.DateTimeField(verbose_name="结束时间")
    location = models.CharField(max_length=100, verbose_name="活动地点")
    max_participants = models.IntegerField(default=50, verbose_name="最大报名人数")
    
    # 费用设置
    is_paid = models.BooleanField(default=False, verbose_name="是否收费")
    price = models.DecimalField(max_digits=10, decimal_places=2, default=0, verbose_name="报名费用")

    author = models.ForeignKey(WeChatUser, to_field='phone_number', on_delete=models.SET_NULL, related_name='activities', verbose_name="发布者", null=True, blank=True)

    is_active = models.BooleanField(default=True, verbose_name="是否启用")
    is_visible = models.BooleanField(default=True, verbose_name="是否显示", help_text="关闭后将不在前端列表页显示")
    auto_confirm = models.BooleanField(default=False, verbose_name="无需审核", help_text="开启后，付费活动支付成功或免费活动报名后直接显示报名成功，不需要审核")
    
    # 常用报名信息开关
    ask_name = models.BooleanField(default=False, verbose_name="收集姓名")
    ask_phone = models.BooleanField(default=False, verbose_name="收集手机号")
    ask_wechat = models.BooleanField(default=False, verbose_name="收集微信号")
    ask_company = models.BooleanField(default=False, verbose_name="收集公司/机构")
    
    signup_form_config = models.JSONField(
        default=list,
        verbose_name="自定义报名配置",
        blank=True,
        help_text='JSON格式的高级配置，若填写则优先于上方开关。例如：[{"name": "job", "label": "职位", "type": "text", "required": true}]'
    )
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")

    def clean(self):
        from django.core.exceptions import ValidationError
        if not self.banner and not self.banner_url:
            raise ValidationError("Banner图片和Banner链接必须至少填写一项")

    def save(self, *args, **kwargs):
        self.clean()
        super().save(*args, **kwargs)

    @property
    def display_banner_url(self):
        """
        获取Banner显示的URL，优先使用上传的图片
        """
        if self.banner:
            return self.banner.url
        return self.banner_url

    @property
    def current_signups(self):
        """
        当前有效报名人数（仅统计已确认/已支付的报名）
        """
        return self.signups.filter(status='confirmed').count()

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "社区活动"
        verbose_name_plural = "社区活动管理"


class ActivitySignup(models.Model):
    """
    活动报名记录
    """
    STATUS_CHOICES = (
        ('unpaid', '待支付'),
        ('pending', '审核中'),
        ('confirmed', '报名成功'),
        ('cancelled', '已取消'),
    )

    activity = models.ForeignKey(Activity, on_delete=models.CASCADE, related_name='signups', verbose_name="活动")
    user = models.ForeignKey(WeChatUser, on_delete=models.CASCADE, related_name='activity_signups', verbose_name="报名用户")
    signup_time = models.DateTimeField(auto_now_add=True, verbose_name="报名时间")
    signup_info = models.JSONField(
        default=dict,
        verbose_name="报名信息",
        blank=True
    )
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='confirmed', verbose_name="状态")
    
    # 关联订单（针对付费活动）
    order = models.ForeignKey('shop.Order', on_delete=models.SET_NULL, null=True, blank=True, verbose_name="关联订单", related_name='activity_signups')

    def __str__(self):
        return f"{self.user.nickname} - {self.activity.title}"

    def check_payment_status(self):
        """
        检查并同步关联订单的支付状态
        """
        if self.status == 'unpaid' and self.order:
            if self.order.status == 'paid':
                self.status = 'confirmed' if self.activity.auto_confirm else 'pending'
                self.save()
                return True
        return False

    class Meta:
        verbose_name = "活动报名"
        verbose_name_plural = "活动报名管理"
        unique_together = ('activity', 'user')


class Topic(models.Model):
    """
    论坛帖子/主题
    """
    title = models.CharField(max_length=200, verbose_name="标题")
    
    CATEGORY_CHOICES = (
        ('discussion', '技术讨论'),
        ('help', '求助问答'),
        ('share', '经验分享'),
        ('notice', '官方公告'),
    )
    category = models.CharField(max_length=20, choices=CATEGORY_CHOICES, default='discussion', verbose_name="分类")
    
    STATUS_CHOICES = (
        ('pending', '待审核'),
        ('published', '已发布'),
        ('rejected', '已拒绝'),
    )
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='published', verbose_name="状态")

    content = models.TextField(verbose_name="内容", help_text="支持Markdown格式，支持插入图片")
    author = models.ForeignKey(WeChatUser, on_delete=models.CASCADE, related_name='topics', verbose_name="作者")
    
    # 关联对象：硬件、服务、课程
    related_product = models.ForeignKey(ESP32Config, on_delete=models.SET_NULL, null=True, blank=True, verbose_name="关联硬件")
    related_service = models.ForeignKey(Service, on_delete=models.SET_NULL, null=True, blank=True, verbose_name="关联服务")
    related_course = models.ForeignKey(VCCourse, on_delete=models.SET_NULL, null=True, blank=True, verbose_name="关联课程")
    
    view_count = models.IntegerField(default=0, verbose_name="浏览量")
    likes = models.ManyToManyField(WeChatUser, related_name='liked_topics', blank=True, verbose_name="点赞用户")
    is_pinned = models.BooleanField(default=False, verbose_name="置顶")
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="发布时间")
    updated_at = models.DateTimeField(auto_now=True, verbose_name="更新时间")
    order = models.IntegerField(default=0, verbose_name="排序")

    def save(self, *args, **kwargs):
        # 记录是否为新对象，因为super().save后pk就有了
        is_new = self.pk is None
        
        # 第一次保存，先入库
        super().save(*args, **kwargs)
        
        # 如果是新创建，且 order 默认为 0（未指定）
        if is_new and getattr(self, 'order', 0) == 0:
            # 将所有其他帖子的 order + 1，腾出 0 的位置
            Topic.objects.exclude(pk=self.pk).filter(order__gte=0).update(order=models.F('order') + 1)
            # 确保自己是 0
            Topic.objects.filter(pk=self.pk).update(order=0)
            self.order = 0

    def __str__(self):
        return self.title

    @property
    def is_verified_owner(self):
        """
        判断作者是否为关联项目（硬件/服务/课程）的已购用户（Verified Owner）
        """
        # 1. 验证硬件
        if self.related_product:
            if Order.objects.filter(
                wechat_user=self.author,
                config=self.related_product,
                status__in=['paid', 'shipped']
            ).exists():
                return True
        
        # 2. 验证课程
        if self.related_course:
            if Order.objects.filter(
                wechat_user=self.author,
                course=self.related_course,
                status__in=['paid', 'shipped']
            ).exists():
                return True
        
        # 3. 验证服务
        if self.related_service:
            pass
            
        return False

    class Meta:
        verbose_name = "论坛帖子"
        verbose_name_plural = "论坛帖子管理"
        ordering = ['order', '-is_pinned', '-created_at']


class Reply(models.Model):
    """
    帖子回复
    """
    topic = models.ForeignKey(Topic, on_delete=models.CASCADE, related_name='replies', verbose_name="所属帖子")
    content = models.TextField(verbose_name="回复内容", help_text="支持Markdown格式")
    author = models.ForeignKey(WeChatUser, on_delete=models.CASCADE, related_name='replies', verbose_name="回复者")
    reply_to = models.ForeignKey('self', on_delete=models.SET_NULL, null=True, blank=True, related_name='children', verbose_name="回复楼层")
    likes = models.ManyToManyField(WeChatUser, related_name='liked_replies', blank=True, verbose_name="点赞用户")
    is_pinned = models.BooleanField(default=False, verbose_name="置顶")
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="回复时间")

    def __str__(self):
        return f"回复: {self.topic.title}"

    class Meta:
        verbose_name = "帖子回复"
        verbose_name_plural = "帖子回复管理"
        ordering = ['-is_pinned', '-created_at']


class TopicMedia(models.Model):
    """
    论坛多媒体资源（图片/视频/文件）
    """
    MEDIA_TYPE_CHOICES = (
        ('image', '图片'),
        ('video', '视频'),
        ('file', '文件'),
    )

    topic = models.ForeignKey(Topic, on_delete=models.CASCADE, related_name='media', verbose_name="所属帖子", null=True, blank=True)
    reply = models.ForeignKey(Reply, on_delete=models.CASCADE, related_name='media', verbose_name="所属回复", null=True, blank=True)
    file = models.FileField(upload_to='community/media/', verbose_name="文件", null=True, blank=True)
    file_url = models.URLField(max_length=500, verbose_name="文件链接", null=True, blank=True)
    media_type = models.CharField(max_length=10, choices=MEDIA_TYPE_CHOICES, default='image', verbose_name="媒体类型")
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="上传时间")

    def __str__(self):
        return f"{self.media_type} - {self.file.name}"

    class Meta:
        verbose_name = "论坛媒体资源"
        verbose_name_plural = "论坛媒体资源管理"


class Announcement(models.Model):
    """
    社区公告模型
    """
    title = models.CharField(max_length=100, verbose_name="公告标题")
    content = models.TextField(verbose_name="公告内容")
    image = models.ImageField(upload_to='announcements/', verbose_name="公告图片", null=True, blank=True)
    image_url = models.URLField(verbose_name="图片链接", null=True, blank=True, help_text="优先使用上传的图片")
    link_url = models.URLField(verbose_name="跳转链接", null=True, blank=True)
    
    is_active = models.BooleanField(default=True, verbose_name="是否启用")
    is_pinned = models.BooleanField(default=False, verbose_name="是否置顶")
    priority = models.IntegerField(default=0, verbose_name="排序权重", help_text="数字越大越靠前")
    
    start_time = models.DateTimeField(verbose_name="开始展示时间", null=True, blank=True)
    end_time = models.DateTimeField(verbose_name="结束展示时间", null=True, blank=True)
    
    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
    updated_at = models.DateTimeField(auto_now=True, verbose_name="更新时间")

    @property
    def display_image_url(self):
        if self.image:
            return self.image.url
        return self.image_url

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "社区公告"
        verbose_name_plural = "社区公告管理"
        ordering = ['-is_pinned', '-priority', '-created_at']